Asjigztoe to- tebi cable cqjffipany



June 24, 1930. HAGEY Re. 17,716

" DEVICE FOR C'OH'I'ROLILING AIR PRESSURE Original Files! Jan. 20, 1917 4 Sheets-Sheet 1 4 v V o m m 1mm x v \N MN M. M0 \Q N Q .Q Q l1", aw. Q l 4 i \b Q 1 i ,VII/VUNN 5 1 a m V \I1 I F HWWWWWWWMMWMM- I I J lm I w l? Hm Ill June 24, 1930. J. c. HAGEY DEVICE FOR CONTROLIQING AIR PRESSURE Original Filed Jan. 20, 1917 4 Sheets-Sheet 2 J1 1ne 24,1930. J. HAGEY I I R 17,716

DEVICE FOR CONTROLLING AIR IRESSURE Original Filed Jan. 20, 1917 4 Sheets-Sheet 3 June 24, 1930. J. c. HAGEY R 17,716

. DEVICE FOR CONTROLLING AIR PRESSURE Original Fil ad Jan. 20, 1917 4 Sheets-Sheet 4 l I ll m H M v. M

III/II; 'IIIIIII/IIIII/I/ V m r s Reissued June 24, 1930 UNITED STATES PATENT OFFICE JAMES CLARKE HAGEY, OF CHICAGO, ILLINOIS, ASSIG-NOR TO THE..CABLE..COMPANY,. OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS Original No. 1,359,698, dated November 23,

reissue filed November 18,.

My invention relates to devices for controling air-pressure and, more specifically, to devices for controlling the air-pressure in the action of automatic musical instruments.

One of the objects out my'invention is to provide such a device which will be eflicient in operation and simple in construction.

A further object of my invention is to provide an improved device of the character indicated by means of which the degree of raretaction of the air in the action of an automatic musical instrument may be varied, either automatically or manually, and which will be prompt and reliable in action under the varying conditions found in practice.

Further objects will appear from the detailed description to follow and from the appended claims.

In the drawings, in which one form of my invention is shown,

Figure 1 is a front elevation of a player piano embodying my invention, parts being broken away to show the interior construction;

Fig. 2 is an elevation of one side of the airpressure-controlling mechanism, parts being broken away to show the interior construction; I

Fig. 3 is an elevation of the other side of the mechanism of Fig. 2, parts being removed to show the interior construction;

Fig. 4 is an elevation of a manually operable valve for controlling the air-pressure, parts being broken away;

Fig. 5 is a section, on the line 55 of Fig.

Fig. 6 is a vertical transverse section of a valve-action, on the line 66 of Fig, 2;

Fig. 7 is horizontal section, on the line .77 of Fig. 3;

Fig. 11 is a vertical section, on the line- 1111 of Fig, 3;

Fig. 12 is a vertical section, on the line of Fig. 1, showing the manually oper- Serial No. 143,483, filed January 20, 1917. Application for 1922. Serial No. 601,841.

able levers for controlling the air-pressure;

Fig. 13 is an enlarged detailed view, showing a spring for frictionally holding one of the manually operable levers in position.

Referring now to the drawings in detail, the player-piano shown is of the pneumatic type, comprising a casing 15; selector-mechanism 16, located in the upper part of the casing, for automatically controllingthe various parts; an air-pump 17 and a motor 18', located in the lower part of the casing, for producing rarefaction of air in the action and motor-wind-chests (not shown) and air-v pressure-controlling mechanism 19, for controlling the pressure of the air in the action wind-chest.

The air-pump 17 may be of any suitable type. It withdraws air from the action wind-chest through the communicating conduits 20 and 21.

The pressure-controlling mechanism 19 controls the air-pressure in the action windchest by placing the conduit 21 in communication with the atmosphere through the conduit 22. This pressure-controller 19 comprises a series of chambers 23, 24, 25, 26 and 27 in communication with each other, respectively, through ports 28, 29, 30 and 31; valve-mechanisms 32, 33, 34 and 35 for con trolling the ports 28, 29, 30, and 31, respectively; ports 36, 3?, 38, 39 and 40 for adnitting air to the chambers 23, 24, 25, 26 and 27, respectively; and air-admission-controlling mechanisms 41, 42, 43, 44 and 45 for controlling the admission of air through the ports 36, 37, 33, 39 and 40, respectively. The lower chamber 27 is in communication with the conduit 22 through a port 45 (Fig.

The valve-mechanisms 32, 33, 34 and 35 are subsiantially alike. Each comprises a valve proper 46 for closing its port, and a pneumatic 47, mounted on a support'48, for actuating the valve. The valvemechanisms 32, 33, 34 and 35 are connected with primary valve-actions .in the primary valve-chest; 49 through'the conduits 50, 5,1, 52 and 53, respectively. The primary valve-chest 49 is in communication with the chamber 27 through the conduit 54. The primary valve-actions may be otany suitable construction (Fig, 6)..

Each comprises a double valve 55, controlling a passage 56 leading to one of the conduits 50, 51, 52 or 53, and a diaphrag1n-pneumatic 57 for actuating valve 55. The chambers 58, under the diaphragm-pneumatics 57 corresponding to the valve-mechanisms 32, 33, 34 and 35, respectively, are in communication with ports in. the tracker 59 through conduits 00, 61, 62 and 63, respectively, leading to the combined junction-and-valve-block 64, and through conduits 05, 66, 67 and 68, respectively, leading from the junction-block to the tracker (Figs. 1, 4 and The valve-block 64 is provided with ports 69, 70, '71 and 72, which communicate with the conduits G0, 61, 62 and 63, respectively, and are controlled by a slide-valve 73, which can be moved to bring an opening 7 4 therein into registration with any one of the ports 69, 70, 71' or 72. This slide-valve 73 is controlled by means of a manually operable lever 75, to which it is connected by means of a rod 76 (Figs. 1, 4 and 12). The slide-valve 73 is held in place and guided in its movement by means of a guide-rod 77, which engages a groove 7 8 in the slide-valve 73.

Each of the mechanisms 41, 42', 43, 44 and for controlling the admission of air comprises a bellows ,79, having its interior in communicationw'ith one of the ports 36, 37

38, 39. or 40 and having a port 80 in its movable lea'li, a port-block 81 having a passage 82 in communication with the port 80, a knife-valve 83 for controlling the flow of air into the passage 82, and an adjustable springmechanism 84 tending to hold the bellows 79 in open or expanded position.

he knife-valve 83 is pivotally mounted on a screw or post 85 andis held in place against'the port-block 81 by means of a wring-member 86, which is also pivot-ally mounted'on the screw 85 and is held slightly compressed, against the knife-valve 83, by the bearing of the screw-head thereupon.

One extremity of thespring-member 86 enaees a notch 87 in the knifeyalve 83 adjata'n cent the free end of the valve, and the other extremity rests against the surface of the knife-valve ad acent the screw 85 (as indicatd rise the intermediate aortion bein r0 vided with an aperture through which the screw 85 extends. The spring-member 80 and the knife-valve 83 are so constructed and proportioned that tightening of the screw 85fplaces a slight end-compression upon the part of the spring-member extending be tween the screw 85 and the notch 87, so that that part of the spring-member reacts laterally against the screw 85 and, on the knife valve,.in a direction downwardly and'away from the head of the screw 85. The other endof the spring-member is so shaped and proportioned that it reacts upwardly against the hcadoi the screw 85and downwardly against the knife-valve 83. On account of the fulcrum-member 90. The fulcrum-member 90 comprises a rock-shaft 91 provided with s a plurality of bearing-members 92, one for engagement with each of the arms or extensions 89 of the valves 83. Each of the arms or extensions 89 is held in engagement with its corresponding bearing-member 92 b means of a leaf-spring 93, secured to the respective arm 89 and bearing against a housing 94 which extends over and encloses the air-controlling mechanisms 41, 42, 43, 44 and 45.

The fulcrum-member 90 may be adjusted to vary the position of the bearmg-members 92 by means of a manually operable lever 95 (Figs. 1, 12 and 13), connected by means of a link 96 to an arm 97 at the upper end of the fulcrum-member 90. For frictionally holding the lever 95 in any position to which it may be moved, a leaf-spring 98 (Figs. 12 and 13) is secured to the under side of the key-bed and bears against a collar 99 secured to the shaft-portion 100 of the over 95. The pressure of this leaf-spring 98 against the collar 99 causes the handleportion 101 of the lever 95 to bear against a friction-plate 102, secured to the key-bed to hold the handle-portion 101 in any desired position. I I

Each of the springmechanisms 84 for the bellows 7 9 comprises a pair or loaf-s rings 103, one end of each spring of the pair being fixedly secured to the movable leaf of the bellows; a yoke-member 104, to which the other end of each of the pair of springs 103 is secured; and an adjusting-screw 105, threaded into a supporting-member 106, extending through an opening in the yoke-meat her 104, and held in place with respect there to by means of a pair of nuts 107. The springs 103 for the different bellows may be made of diiferent' effective strengths in various ways, as, by varying the weight of the material used, by varying the number ofleaves in the spring, and by varying the manner of attachment to the bellows. Instead of, or in.

addition to, this employment ofsprings of (ill The operation of my improved device is as follows: A suitably perforated music-roll 114 is placed in position in the roll-box 115 and its leader-end is attached to the take-up roll 116. This music-roll 114 is provided with suitable perforations for controlling the sounding of the notes and is also provided with suitable perforations for co-operating with Qhose openings of the traclrer 59'which are in communication with the conduits 65, 66, 67 and 68.

If it is desired that the pressure-controller 19 shall be controlled solely by the musicroll 114, the lever is allowed to occupy the position shown in Fig. 1, in which the slidevalve 73 closes all of the ports 69, 70, 71 and 72.

The motor 18 is put in operation to actuate the air-pump 17 to withdraw air from the wind-chests of the instrument and produce a rarefaction of the air therein, whereby the striker-pneumatics and roll-motor may be operated.

To control the air-pressure in the action wind-chest, and consequently the loudness or volume with which the notes may be sounded, the pressure-controller 19 is operated to admit air more or less freely into the conduit 22, which communicates with the conduit 21. The freedom with which air is admitted to the conduit 22, through the pressure-controller 19, may be varied by selectively closing any one of the valve-mechanisms 32, 33, 34 or 35.

The air-admission-controlling mechanisms 41, 42, 43, 44 and 45 are so constructed that each requires a different degree of rarefaction of air to cause it to operate to open its valve 83 to admit air to its passage 82. This may be obtained in various ways, such as by the method I have described, i. e., that of opposing the collapse of the bellows 7 9 of the difi'erent controlling mechanisms by springs of relatively different strengths; or by the well-known alternative method I have mentioned, i. e., that of employing bellows 79 of relatively different sizes. The upper air-admission-controlling mechanism 41 operates under the least degree of rarefaction of air. The air-admission-controlling mechanism 42 requires a somewhat higher degree of rarefaction of air to cause its operation than does the mechanism 41, and so on down, the mechanism 45 requiring the highest degree of rarefaction of air for its operation.

Then all of the ports 28, 29, 30 and 31 are open, the upper air-admission-controlling mechanism 41 controls the admission of air to the conduit 22. This air-admission-controller 41 operates, under a comparatively low degree of rarefaction of air, to admit atmospheric air through its, passage 82. This admission of atmospheric air tends to prevent the air in the conduit 21 and, consequently, the air in the action wind-chest, from being still further rarefied. If air is being admitted to the action wind-chest in comparatively small quantities, as would be the case when comparatively few notes were being sounded, the operation of the pump 17 tends to causeia higher degree of rarefaction in the action wind-chest and, consequently, in the conduit 22, and this results in a further collapse of the bellows 79 of the air-admission-controller 41. This collapsing movement of the bellows 79 increases the opening of the valve 83 and allows a freer admission of atmospheric air to the passage 82, thus tending to prevent any higher degree of rarefaction of air in the conduits 22 and 21 and in the action wind-chest. If air is admitted in comparatively large quantities to the action wind-chest, as would be the case if a comparatively large number of notes were being sounded, it tends to lower the degree of rarefaction of air in the windchest and, consequently, in the conduits 21 and 22. This decrease in the rarefaction of air causes the bellows 79 of the controller 41 to expand somewhat to cause the valve 83 to move in a direction to restrict the admission of atmospheric air to the passage 82. This restriction of the admission of atmospheric air tends to prevent a further decrease of the rarefaction of air in the conduits 22 and 21 and, consequently, in the action wind-chest. The bellows 7 9 constitutes a chamber having a movable wall, the position of which varies with the degree of rarefaction of air.

The action of the other air-admission-controllers 42, 43, 44, and 45 is substantially the same as the operation of the controller 41, except that the controllers 42, 43, 44 and 45 operate under successively higher degrees of rarefaction of air.

If the port 28 is closed, the ports 29, 30, and 31 remaining open, the air-admission-controller 42 is brought into operation to control the admission of air to the-conduit 22 and, consequently, the degree of rarefaction of air which is maintained in the action wind-chest. This is the condition shown in Fig. 2, in which the flow of air, through the ports 29, 30, and 31 to the conduit 22', is indicated by arrows.

If theport 29 is closed, the ports 30 and 31 remaining open, the controller 43 becomes effective to control the degree of rarefaction of air in the action windchest.

If the port 30 is closed, the port 31 remaining open, the controller 44 is brought into operation to control the pressure. This is the condition shown in Fig. 9, in which the flow of air, past the. valve 83, through the passage 82, ports 80, 39 and 31, chamber 27, and port 45, to the conduit 22, is indicated byarrows.

If the port 31 is closed, the controllerv 45 is brought into operation to control the airpressure.

Thus the closing of each one of the ports 28, 29, 30 and 31 results in a difference in the freedom with which atmospheric air is admitted, and a consequent difference in the degree of rarefaction of the air in the con,-

duit 21 and the action wind-chest.

The controllers41, 42, 43, 44 and can.

be individually adjusted to give the desired effect, by means of the screws 105, for ad justing the springs 103 to vary the degree of rarefaction of air required to collapse the bellows 79 to cause the valves 83 to uncover their respective ports.

The controllers 41, 42, 43, 44 and 45 may be collectively adjustedby means of the fulcrum-member 90, which can be shifted to vary the position of the bearing-members 92- to vary the degree of collapse of the bellows ,79 required to cause the valves 83 to open theirzports. Thus, if the lever 95 is moved to the right, to the position marked Light, in Fig. 1, the bearing-members92 will be moved to the position shown in Fig. 8, which .will cause the valves 83 to open on a, comparatively slight degree of collapse of the bellows 7 9 while, if the lever is moved to the left, to the position marked Heavy, the bearing-members 92 will be moved to the position shown in Fig. 7, in which the valves 83 will not be opened until the bellows 79 have been collapsed to a comparatively great I extent and considerably greater, strain has been placed upon the springs 103. Consequently, moving the lever 95 to the right (Fig. 1) will decrease the volume, and moving it to the left will increase the volume. Since the springs 103 for thedii'lerent bellows 7 9 are of different strengths, the col lective adjustment effected by means of the fulcrum-member 90 will atiect the individual degrees of air-pressure controlled by the air admission-controlling mechanisms 41, 42, 43, 44 and. 45 differently.

just the position ofthe bearing-members 92, will change the openingpoint of all of the knife-valves 88, and this change will be the same for all of the valves. But as the springs .103 for the difi'erent bellows are of different strengths, the change in air-tension, corresponding to the change in position at which the valves 83 open, will be diflerent for the different mechanisms 41, 42,43, 44 and 45.

For selectively closing the ports 28, 29, 30

and 31, for varying the pressure in the windchest, the music-roll 114 is provided with suitable perforations for selectively effecting the closing of the valve-mechanisms 32, 33,

' 1 34 and 35. Thus, if it is desired tobring the air-admisslon-controller 42 into operation to control the pressure of the air in the action wind-chest, the music-roll 114 is provided with a perforation through which air is admitted to the conduits and 60 to cause the corresponding pneumatic 57 and valve 55 to be raisedtoadmit air to the conduit '50 to causethe valve-mechanism 32 to close the port 28.

Ina similar manner, any one of the con- To explain further, a shifting of the fulcrum-member 90, to ad- I trollers 41, 43, 44 or 45 can be brought into operation.

The same effects may be secured'by operating the slide-valve 73 by means of the lever 75 to selectively admit air to the ports 69, 70, 71 or 72 and thus manually control the operation of the corresponding pneumatics 57 and valves 55. By this method of controlling the admission of air to the valve-mechanisms 32, 33, 34 and 35, the desired air-admission-controller may be brought into operation and the desired degree of rarefaction of the air in the action wind-chest be obtained, under manual control.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is l. A devlce for controlling air-pressure,

comprising a plurality of chambers, each pro-- vided with a movable wall, means affording communication. between each of said chambers and a producer of rarefied air, means whereby the position of each movable wall varies according to the degree of rarefaction of the air, atmospheric air-inlet-means, valvemeans controlling said airinlet-means and separately controllable by the movable walls of said chambers, and means for controlling the operation of one or more of the movable walls.

2. A device for controlling air-pressure, comprising a plurality of chambers, each provided with a movable wall, means ailording communication between each of said chambers and a producer of rarefied air, means whereby the position of each movable wall varies according to the degree of rarefaction of the air, atmospheric air-inlet-means, valvemeans controlling said air-inlet-means and separately controllable by the movable walls of said chambers, and sheet-controlled means for controlling the operation of one ofthe movable walls 3. A device for controlling air-pressure, comprising a. plurality of chambers, each provided with a movable wall, means at fording communication between each of said chambers and a producer of rarefied air, means whereby the position of each movable wall varies according to the degree of rarefaction of the air, atmospheric air-inlet-means,

valve-means controlling said air-inlet-means and separately controllable by the movable walls of said chambers, and means for selectively controlling'the operation of one or,

more of the movable walls.

4. A device for controlhng alt-pressure,

comprising a plurality of chambers, each pro vided with a: movable wall, means affording communication between each of said chambers and a producer of rarefied air, means whereby the position of each movable wall varies according to the degree of rarefaction of the air, atmospheric air-inlet-means, valve-means controlling said air-inletmeans and separately controllable by the movable walls of said chambers, and sheet-controlled means for selectively controlling the operation of one or more of the movable walls.

5. A device for controlling air-pressure, comprising a plurality of chambers, each provided with a movable wall, means affording communication between each of said chambers and a producer of rarefied air, means whereby the position of each movable wall varies according to the degree of rarefaction of the air, atmospheric air-inlet-means, valve-means controlling said air-inlet-means and separately controllable by the movable walls of said chambers, and valve-means for controlling the communication between one of said chambers and the producer of rarefied air.

6. A device for controlling air-pressure, comprising a plurality of chambers, each provided with a movable wall, means affording communication between each of said chambers and a producer of rarefied air, means whereby the position ofeach movable wall varies according to the degree of rarefaction of the air, atmospheric air-inlet-means', valvemeans controlling said air-inlet-means and separately controllable by the movable walls of said chambers, and sheet-controlled valvemeans for controlling the communication between one of said chambers and the producer of rarefied air.

7. A device for controlling air-pressure, comprising a plurality of chambers, each provided with a movable wall, means affording communication between each of said chambers and a producer or" rarefied air,

means whereby the position of each movable 'tvall varies according to the degree of rarefaction of the air, atmospheric air-inletmeans, valve-means controlling said air-inlet-means and separately controllable by the movable walls of said chambers, and a second valve-means for controlling said air-inletmeans.

8. A device for controlling air-pressure, comprising a plurality of chambers, each provided with a movable wall, means affording communication between each of said chambers and a producer of rarefied air, means whereby the position of each movable wall "aries according to the degree of rarefaction of the air, atmospheric air-inlet-means, valvemeans controlling said air-inlet-means and separately controllable by the movable walls of said chambers, and sheet-controlled valvemeans for controlling said air-inlet-means.

9. A device for controlling air-pressure, comprising a plurality ofchambers, each provided with a movable wall, means affording communication between each of said chambers and a producer oi rarefied air, means whereby the position of each movable wall varies according to the degree of rarefaction of the air, atmosphericiair-inlet-means, valvemeans controlling said air-inlet-means and separately controllable by the movable walls of said chambers, and valve-means for selectively controlling the communication between one or more of said chambersand the producer of rarefied air.

10. Adevice for controlling air-pressure, comprising a plurality of: chambers, each provided with a movable wall, means affording communication between each oi said chambers and a producer of rarefied air, means whereby the position of each movable wall varies according to the degree of rarefaction of the air, atmospheric air-inlet-means, valve-means controlling said air-inlet-means and separately controllable by the movable walls of said chambers, and sheet-controlled valve-means for selectively controlling the communication between one or more of said chambers and the producer of rarefied air.

11. A device for controlling air-pressure, comprising a plurality of chambers, each provided with a movable wall, means affording communication between each of said chambers and a producer of rarefied air,'means whereby the position of each movable wall varies according to the degree of rarefaction oi the air, a plurality of atmospheric air-in lets, valve-means controlling said air-inlets and separately controllable by the movable walls of said chambers, and a second valvemeans for selectively con-trolling said airinlets.

12. A device for controlling air-pressure, comprising a plurality of chambers, each provided with a movable wall, means aifording communication between each of said chambers and a producer ofrarefied air, means whereby the position of each movable wall varies according to the degree of rarefaction of the air, a plurality of atmospheric air-inlets, valve-means controlling said air-inlets and separately controllable by the movable walls of said chambers, and sheet-controlled valve-means for selectively controlling said air-inlets.

13. A device for controlling air-pressure, comprising a plurality of chambers, each provided with a movable wall, means affording communication between each of said chambers and a producer of rarefied air, means whereby the position of each movable wall varies according to the degree of rarefaction of the air, a plurality of atmospheric ports, one for each of said chambers, a valve for each of said ports, each controlled by one of the movable walls,-and a valve forcontrolling the communication between one of said chambers and the producer of rarefied air.

14. A device for controlling air-pressure, comprising a plurality of chambers, eachpro vided with a movable wall, means affording communication between each of said chambers and a producer of rarefied air, means whereby the position of each movable wall varies according to the degree of rarefaction in communication with said chamber, a valve controlling said port and controlled by the movable wall, and a valve for controlling the communication between said chamber and the producer of'rarefied air.

16. A device for controlling air-pressure, comprising a chamber provided with a mov- "able wall, means affordin g communication be tween said chamber and a producer of rarefied air, means whereby the position oi the movable'wall varies according to the degree of rarefaction of the air, an atmospheric port in communication with said chamber, a valve controlling said port and controlled by the movable wall, and a sheet-controlled valve for controlling the communication between said chamber and the producer of rarefied air.

17. A device for controlling air-pressure, comprising a chamber provided with a movable wall, means affording communicationbetween said chamber and a producer of rarefied air, means whereby the position of the movable wall varies according to the degree of rarefaction of the air, an atmosphericport in communication with the producer of rarefier air, a valve controlling said port, and controlled by the movable wall, and a sheetcontrolled valve for controlling the'communication between said chamber and the pro ducer of rarefied air.

' 18. "A device for controlling air-pressure,

- comprising a chamber provided with a/movable wall, means aflordlng communication between said chamber and a producer of rarefied air, means whereby the' position of'the movable wall varies according to the degree of rarefaction of the air, an atmospheric port in communication with the producer of rarefied air, a valve controlling said port and con trolled bythe movable wall, and a valve for controlling the communicationv between said port andthe producer of rarefied air.

19. A device for controlling air-pressure,

comprising a chamber provided with a movablev wallfmeans affording communication I between said chamber and'a producer of rarefied air,m'eans whereby the position of the movable wall varies accordlng to the degree of rarefaction of the a1r,an atmospheric port tween said chamber and a aroducer of rarefied air, means whereby the position of the movable wall varies according to the degree of 'rarefaction of the air, an atmospheric port in communication with the producer of rarefied air, a valve cont-rolling said port and controlled by the movable wall, and a sheet-controlled valve for controlling the commuhica tion between said port and the producer of rarefied air.

21. A device for controlling air-pressure, comprising a plurality of chambers, each provided with a movable wall, means affording communication between each of said chambers and a producer of rarefied air, means whereby the position or" each movable wall varies according to the degree of rarefaction of the air, atmospheric air-inlet-means, valvemeans controlling said air-inlet-means and separately controllable by the movable walls of said chambers, and valve-means for controlling the operation of said valve-means.

22. A device for controlling air-pressure, comprising a chamber provided with a movable wall, means afliording communication between said chamber and a producer of rare? fied air, means whereby the position of the movable wall varies according to the degree of rarefaction of the air, an atmospheric port in communication with said chamber, a valve controlling said port, means whereby the wall in its movement causes said valve to f open said port, and adjustable setting-means vided with a movable wall, means affording communication between each of said chambers anda producer of rarefied air, means whereby the position ofeach movable wall varies according to the degree of rarefaction of the air, atmospheric air-inleti-means, a plurality of valve-means for controlling said air-inlet-means and separately controllable bythe movable wallsofsaid chambers, and valve-means for selectively controlling the operation of one or more of said valve-meana 24. A device for controlling air-pressure, comprising a chamber provided with a movable wall, means affording,communication between said chamber and a producer of rarefied air,'means whereby the position of the movable wall varies according to the degree of rarefaction of the air, an atmospheric port in communication with the producer of rare fied air, a valve controlling said port, means whereby the wall in its movement causes said valve to open said port, and adjustable settmg-means through which the device may be set so that the movable wall will cause said valve to open said port at any predetermined one of a plurality of different positions of the movable wall.

2). A device for controlling air-pressure, comprising a chamber provided with a movable wall, means affording communication between said chamber and a producer of rarefied air, means whereby the position of the movable wall varies according to the degree of rarefaction of the air, an atmospheric port in communication with the producer of rarefied air, a valve controlling said port, means whereby the wall in its movement causes said valve to open said port, adjustable settingmeans through which the device may be set so that the movable wall will cause said valve to open said port at different degrees of rarefaction of the air, and means for holding said setting-means in any one of a plurality of different positions.

26. A device for controlling air-pressure, comprising a plurality of chambers, each provided with a movable wall,'means affording communication between each of said chambers and a producer of rarefied air, meanswhereby the position of each movable wall varies according to the degree of rarefaction of the air, an atmospheric port for each of said chambers in communication with the producer of rarefied air, a plurality of valves, one for each port, means whereby each wall in its movement causes one of said valves to open its port, adjustable setting-means through which the device may be set so that the respective movable wall will cause said one of said valves to open its port at different degrees of rarefaction of the air and means for holding said settingmeans in any one of a plurality of different positions.

27. A device for controlling air-pressure,

' comprising a chamber provided with a movable wall, means afiording communication between said chamber and a producer of rarefied air, means whereby the position of the movable wall varies according to the degree of rarefaction of theair, an atmospheric port in communication with said chamber, a valve controlling said port, means whereby the wall in its movement causes said valve to open said port, adjustable setting-means through which the device may be set so that the movable wall will cause said valve to open said port at different degrees of rarefaction of the air, and means for holding said setting-means in any one of a plurality of different positions.

28. A device for controlling air-pressure, comprising a chamber provided with a movable wall, means affording communication between said chamber and a producer of rarefied air, means whereby the posit-ion of the movable wall varies according to the degree of rarefaction of the air, and atmospheric port in communication with the producer of rarefied air, a valve controlling said port, means whereby the wall in its movement causes said valve to open said port, adju setting-means through which the device may be set so that the mcvable wall will cause said valve to open said port at any predetermined one of a plurality of dill'erent positions of the movable wall, and means for holding said setting-means in any one of a plurality of different positions.

29. A device for controlling air-pressure, comprising a plurality of chambers, each provided with a movable wall, means afford ing communication between each of said chambers and a producer of rarefied air, means whereby the position of each movable wall varies according to the degree of rarefaction of the air, an atmospheric port for on of said chambers in communication with the producer of rarefied air, a plurality of valves, one for controlling each port, means whereby each wall in its movement causes one of said valves to open its port, adjustable setting-means through which the device may be set so that the respective movable wall will cause said one or" said valves to open its port at any predetermined one of a plurality of different positions of the movable wall, and means for holding said setting-means in any one of a plurality of different positions.

30. A device for controlling air-pressure for musical instruments, comprising a plurality of chambers, each provided with a movable wall, means affording communication between each of said chambers and a producer of rarefied air, means whereby the position of each movable wall varies according to the degree of rarefaction of the air, a plurality of atmospheric ports, one for each or said chambers, a plurality of' valves, one for each of said ports, and means whereby each wall in its movement causes one of said valves to open its port; each of said valves controlling the pressure for the same playing mechanism.

31. A device for controlling air-pressure, comprising a plurality of chambers, each provided with a movable wall, means affording communication between each of said chambers and a producer of rarefied air, means whereby the position of each'movable wall varies according to the degree of rarefaction of the air, a plurality of atmospheric ports, one for each of said chambers, a plurality of valves, one for each of said ports, means'whereby each wall in its movement causes one of said valves to open its port, and adjustable setting-means through which the device may be set so that each movable wall will cause one of said valves to open its portat different degrees of rarefaction of the air.

lectively.

32. A device for controlling air-pressure, comprising a plurality of chambers, each provided with a movable wall, means affording communication between each, of said chambers and a producer of rarefied air, means whereby the position of each movable wall varies according to the degree of rarefaction of the air, a plurality of atmospheric ports, one for eachof said chambers, a plurality of valves, one for each of said ports, means whereby each wall in its movement causes one of said valves to open its port, and adjustable setting-means through which the device may be set so that each movable wall will cause one of said valves to open its port at a different degree of rarefaction of the air from that at which another movable wall causes the opening of its port.

33. A device for controlling air-pressure, comprising aplurality of chambers, each provided with a movable wall, means afi ording communication between each of said chambers and a producer of rarefied air,

means whereby the position of each movable wall varies according to the degree of rare- :Eaction of the air, a plurality of atmospheric ports, one for each of said chambers, a plurality of valves, one for each of said ports, means whereby each wall in its movement causes one of said valves to open its port, and adjustable setting-meansthrough which the device may be set so that each movable wall will cause one of said valves to open its port at any one of a plurality of diil'erent degrees of rarefaction of the air; said setting mea-ns being constructed to control said valves (:01-

34. A device for controlling air-pressure, comprising a plurality of chambers, each provided with a movable wall; means affording communication between each of said chambers and a producer of rarefied air; means whereby the position of each movable wall varies according to the degree of rarefaction of the air; a plurality of atmospheric ports, one for each of said chambers; a plurality of valves, one for each of said ports; meanswhereby each wall inits movement causes OIIGZOf said valves to open its port; adjustable setting-means through which the device may beset so that each movable wall ,.W1llC1l1S6.0I1B Of said valves to open ts port at any one of a plurality of different degrees of rarefaction of the air, said setting-means being constructed to control said valves collectively; and a valve for controlling the communication between one. of sald chambers and the producer of rarefied'air.

35. A device for controlling air-pressure, comprising a plurahty of chambers, each provided with a movable wall; means afiording communication, between each of V said chambers and a producer of rarefied air;

means i'whereby theiposition of each movable wall varies according to the degree of rarefaction of the air; atmospheric air-inletmeans; a plurality of valve-means controlling said air-inlet-means controlled by the movable walls of said chambers; adjustable setting-means through which the device may be set so that each movable wall will cause one of said valve-means to open said air-inletmeans at any one of a plurality of different degrees of rarefaction of the air, said settingmeans being constructed to control said valve-means collectively; and a second valvemeans for controlling said air-inlet-means.

36. A device for controlling air-pressure, comprising a plurality of chambers, each provided with a movable wall means affording communication between each of saidchambers and a producer of rarefied air; means whereby the position ofeach movable wall-varies accordingto the degree of raretaction of the air; atmospheric air-inletmeans; a plurality of valvemeans controlling said air-inlet-means controlled by the movable walls of said chambers; adjustable settingmeans through which the device may be set so that each movable wall will cause one of said valve-means to open said air-inlets means at anyone of a plurality of different degrees o1 rarefaction of the air, said settingmeans being constructed to control said valve-means collectively; and a sheet-controlled valve-means for controlling said airinlet-means.

37. A device for controlling air-pressure, comprising a plurality of chambers, each provided with a movable wall; means afiording communication between each of said chambers and a producer of rarefied air; means whereby the position of each movable wall varies according to the degree ofraretactionof the air; atmosphericairinlet-means; a plurality of valve-means controlling said air-inlet-means controlled by the movable walls of said chambers; adjustable setting-means through which the device may be set sothat each movable wall will cause one of said valve-means to open saidair-inlet-means at any one of a plurality of difiierent degrees of rarefaction of the air, said setting-means being constructed to control said valve-means individually; and a second valve-means for controlling said airinlet-means.

38. A device for controlling air-pressure,

comprising a plurality of chambers, each 7 provided with a movable wall;'means afiordmg communication between ,each'of said chambers and a producer ofrarefied air; meanswhereby the posit-ion of each movable wall varies according to the degree of rarefaction of the air; a plurality of atmospheric ports, one for each of said chambers; a plurality of valves, one for each ofsaid ports; means whereby eachwall in its movement causes one of said valves to open. its port;

adjustable setting-means through which the device may be .set so that each movable wall will cause one of said valves to open its port at anyone-of a plurality of difierent degrees of rarefaction of the air,said setting-means being constructed to control said valves collectively; and a valve for controlling the communication between one of said ,ports and the producer of rarefied air.

39. .A device for controlling. air-pressure, comprising .a plurality of chambers, each provided with a movable wall, means aifording communication between each of said chambers and a producer of rarefied air, means whereby the position of each movable wal-l varies according to the degree of rare faction of the air, a ,plurality of atmospheric ports, one for each of said chambers, aplurality of valves, one for each of said ports, means whereby each wall in its movement causes one of said valves to open its ,port, and adjustable setting-means through which the device may be set so that each. movable wall will cause one :of said valves to open its port at any one of a plurality of different degrees of rarefaction of the air; said setting-means being constructed .to control said valves individually. v

40. A device for controlling aippressure, comprising a plurality of chambers, each provided with a movable wall; means affording communication between each of said chambers and a producer of rarefied air; means whereby the position of each movable wall varies according to the degree of rarefaction of the air; a plurality of atmospheric ports, one for each of said chambers; a plurality of valves, one for each of said ports; means whereby each wall in its movement causes one of said valves to open its port; adjustable setting-means through which the device may be set so that each movable wall will cause one of said valves to :open its port at any one of a plurality of different degrees of rarefaction of the air, said setting-means being constructed to control said valves individually; and a valve for controlling the communication between one of said chambers and the producer of rarefied air.

41. A device for controlling air-pressure, comprising a bellows having a movable leaf, means affording communication between said bellows and a producer of rarefied air, means whereby the position of the movable leaf varies according to the degree of rarefaction -of the air, an atmospheric port carried by the movable leaf and'communicating with the interior of said bellows, a valvemember pivotally mounted on the movable leaf for controlling said port, and an adjustable fulcrum-member for controlling the movement of said valve-member.

42. A device for controlling air-pressure, comprising a plurality of'bellows, each having a movable leaf; means afi'ording communication between each of said bellows and a producer of rarefied air; atmospheric ports, one communicating with the interior ofeach of said bellows, respectively; a plurality of valve-members, one pivotallj mounted on each movable leaf, for controlling said atmospheric ports; and adjustable fulcrum-means for controlling the move ment of said valve-members collectively.

43. A device for controlling air-pressure, comprising a plurality of chambers, each provided with a movable wall, means affording communicationbet-ween each of said chambers and a producer of rarefied air, means whereby the position of each movable wall varies according to the degree of rarefaction of the air, a plurality of atmospheric ports, one for each of said chambers,

'a plurality of valves, one for each of said ports, and means whereby each wall in its movement causes one of said valves to open its port; said device being constructed so that the respective ports will be opened under different degrees of rarefaction of air.

44. A device for controlling air-pressure, comprising a plurality of chambers,'each provided with a movable wall; means affording communication between each of said chambers and a producer of rarefied air; means whereby the position of each movable wall varies according to the degree of rarefaction of the air; a plurality of atmospheric ports, one for each of said-chambers; a plurality of valves, one for each of said ports; means whereby each wall in its movement causes one of said valves to open its port, said device being constructed so that the respective ports will be opened under different degrees of rarefaction of air; and-a valve for controlling communication between one of said chambers and the producer of rarefied air.

45. A device for controlling air-pressure, comprisinga plurality of chambers, each provided with a movable wall; means affording communication between. each of said chambers and a produa-er of rarefied air; means whereby the position of each movable wall varies according to the degree of rarefaction of the air a plurality of atmospheric ports comm-unicating with the producerofrarefied air, one for each of said chambers; a plurality of valves, one for each of said ports; means whereby each wall in its movement causes one of said valves to open its port, said device being constru-cted so that the respective ports will be opened under different degrees of rarefaction of air; and a valve forcontrolling communication between one of said ports and the pro ducer of rarefied air.

46. A device for controlling air-pressure, comprising a. plurality of chambers, each provided with a movable wall; means affording communication between each of said chambers and a producer of *rarefiedair; means whereby the position of each movable wall varies according to the degree of rarefaction ofthe one for each of said chambers; a plurality of valves, one for each of saidfports; means whereby each wall in its movement causes one of said valves to open its port, said device being constructed so that the respective ports will be opened under diiferentdegrees of rare faction of air; and'a sheet-controlled valve for controlling communication betwen one of said ports and the producer of rarefied air.

47. A device for controlling air-pressure, comprising a chamber provided with a movable wal1,means affording communication between said chamber and a producer of rarefied air, means whereby the position of the movabl wall varies according to the degree of rare faction of the air, an atmospheric port in communication with the producer of rarefied air, a valve controlling said port and controlled by the movable wall, and controllingmeans between said port and the producer of rarefied air for rendering said port inopera tiveto supply air to the producer of rarefied air.

48. A device for controlling air-pressure, comprising a plurality of chambers, each provided with a movable wall; means affording communication between each of said chambers and a producer of rarefied air; means whereby the position of each movable wall varies according to the degree of rarefaction of the air; a plurality of atmospheric ports, onefor each ofsaid chambers; a valve for each of said ports,'each controlled by one of the movable walls; and controllingmeansfor rendering one of said ports inoperative to supply air to the producer of rarefied air. j

' 49. A device for controlling air-pressure, comprising a plurality of chambers, each provided with a movable wall; means afl'ording communication between each of said chambers and a producer of rarefied air; means whereby the position of each movable wall varies according'to the degree of rarefaction of the air; a plurality of atmospheric ports, one for each of said chambers; a valve for each of said ports, each controlled by one ofthe movable walls; and sheet-controlled controlling-means for rendering one of said ports inoperative to supply air to the producer of rarefied air.

50. A device for controlling air-pressure, comprising two chambers; means affording communication.between one of said chambers and a producer of rarefied air; a port affording communication between said chambers;

a valve controlling saidport; two atmospheric 1 ports, one communicating with each of said chambers; two valves, one for each of said atmospheric ports; two movable members, one for controlling each of said; two valves; and means whereby the position of said movable membersvaries withthe degree of rarefactionofthealr.

51. 'A" device and a producer of rarefied air; a port afford ingbommu'nication between said chambers; a valve controllingsaidport; two bellows, one communication with each of said chambers;

two atmospheric ports, one communicating .and a producer of rarefied air; a port affording" communication between said 'cham-l bers; a valve controlling said port; a pneumaticcontrolling said valve; two bellows, one incommunication with each of said chambers; two atmospheric ports, one communieating with each of said chambers; and a Valve for each'ofsaidatmospheric ports, one controlled'by' each of said bellows. I

53. An expression-device for automatic musical instruments, comprising a member adjustable for varying the expression, and manual means foractuating said member and holding it in adjusted position, comprising a rock-shaft, a handle upon said rock-shaft, a bearing-member along which said handle moves, andwpring-means for forcing said rock-shaft longitudinally to cause said handie to bear against said bearing-member. device-for controlling air-pressure, comprising abellows having-a movable leaf, means affordingcommunication between said bellows and a producerof rarefied air, means whereby the position of the movable leaf varies according to thedegree of rarefac'tion of the air, an'atmospheric port carried by themovable leaf and communicating with I for controlling air-pressure, comprising two chambers; meansfafi'ordmgf communlcation between one of'said-chambers;

the interior of said bellows,fa valve-member p'ivotally mounted on the movable leaf for controlling said port, an adjustable fulcrummember for controlling the movement of said valve-member, andspring-means for holding said valve-memberagainst said fulcrummember. a V

55. A valve-mechanism comprising a piv oted valve, a pivot-post on which said valve is mounted, and" a 'compr'essionnnember, extending betweenthe outer portion of said pivot-postand the free end of said valve, and reacting laterally "on said pivot post and in wardly and away from said pivot-poston saidvalve. X,

56. Avalve mechanism comprising a piv oted valve,a pivot-post on which saidvalve is mounted, a spring compression-mem-- her, exte'ndingbetween the, outer portion of said pivot-post andthe freeend' of said valve, and reacting laterallyon said pivot post and inwardly and away from said valve.

57. A valve-mechanism comprising a piv' oted valve-member; a pivot-post; and a spring-member, comprising a spring C0111 pression-portion extending between the outer portion of said pivot-post and the free end of said valve-member and reacting laterally on said pivot-post and inwardly and away from said pivot'post on said valve-member, and a portion extending from said pivot-post on the side opposite from said compressionportion and reacting inwardly on said valvemember and outwardly on said pivot-post.

58. A device for controlling air-pressure for musical instruments, having means for controlling air-pressure at any one of a plurality of predetermined, selectable, individually different degrees, and means for adjusting said device to vary individually, with relation to each other, and collectively, as a whole, the degrees of air-pressure controlled thereby, the collective'adjustment affecting the individual degrees of air-pressure differently.

59. A device for controlling air-pressure for musical instruments, having means for controlling air-pressure at any one of a plurality of predetermined, selectable, indiv dually different degrees, means for ad usting said device to vary individually, with relation to each other, the different degrees of air-pressure-control, and other means for adjusting said device to vary collectively, as a whole, the different degrees of air-pressurecontrol, the collective adjustment affecting the individual degrees of air-pressure differently.

60. A device for controlling air-pressure for musical instruments, comp-rising individual regulator-units capable of controlling air-pressure at individually different degrees, and means for separately and collectively adjusting said individual regulator-un ts and the degrees of air-pressure controllable thereby.

61. A device for controlling air-pressure for musical instruments, comprising ind vidual regulator-units capable of controlling air-pressure at individually diflerent degrees, means for separately adjusting said indiv dual regulator-units and the degrees of airpressure controllable thereby, and other means for collectively ad usting sa d individual regulator-units and the degrees of airpressure controllable thereby.

62. A device for controlling air-pressure, comprising a plurality of chambers, each provided with a movable wall, means affording communication between each .of sa d chambers and a producer of rarefied air, means whereby the position of each movable wall varies according to the degree of rarefaction of the air, a plurality of atmospheric ports, one for each of said chambers, a plu:

said pivot-post on.

rality of valves, one for each ofsaid ports, means whereby each wall in its movement causes one of said'valves to open its; port, and adjustable setting-means through which the device may be set so that, compared with each other, the movable walls will cause the opening of their respective ports at :difii'erent degrees of rarefaction of the air, and so that each movable wall will cause the opening of its port at any predetermined one of a pluralify of different positions of the movable Wa 63. A device for controlling air-pressure, comprising a chamber provided with a movable wall, means affording communication between said chamber and a producer of rarefied air, means whereby the position of the movable wall variesaccording to the degree of rarefaction of the air, an atmospheric port in communication with the producer of rarefied air, a valve controlling said port, means whereby the wall in its movement causessaid valve to open said port, adjustable means through which the device may be set so that the movable wall will cause said valve to open said port. at different degrees of rarefaction of the air. and other adjustable means through which the device may be set so that the movable wall will cause said valve to open said port at any predetermned one of a plurality of different positions of the movable wall.

64. device for controlling air-pressure, comprising a plurality of chambers, each providedwith a movable wall, means affording communication between each of said chambers and a producer of rarefied air, means whereby the position of each movable wall varies according to the degree of rarefaction of the air, a plurality of atmospheric ports, one for each of said chambers, a plurality of valves, one for each of saidports, means whereby each wall inits movement causes one of said valves to open its port, adjustable means through which the device may be set so that, compared with each other, the movable walls will cause the opening of their respective ports at different degrees of rarefaction of the air, and other adjustable means through which the device may be set so that each movable wall will cause the opening of its port at any predetermined one of a plurality of different positions of themovable wall. V v

65. A device for controlling air-pressure, comprising a-chamber provided with-a movable wall, means affording communication between said chamber and a producer of rarefied air, means whereby the position of the movable wall varies according to the degree of rarefaction of the air, an atmospheric port in communication with the producer of rarefied air, a valve controlling said port, means 'wherebythe wall in its movement causes said valve to open said port, and adjustablemeans "through which the device comprising a chamber provided with amov able .wall, means affording communication between said chamber and a producer; of

rarefied .air, means whereby the position of the movable wall varies according to the de-' gree of rarefactlon of the air, an atmospheric port in communication with said chamber,

a valve controlling said port and controlled by the movable wall, and means for control ling the operation ofsaid valve.

67. Aldevice for controllingair-pressure, comprising-a plurality of chambers, each provided with a movable wall, meansaifording communication between each of said cham bers anda producer of rarefied'air, means whereby the position of each movable 'wall varies according to the degree of rarefaction ofthe air, atmospheric airinlet-means, valve-means controlling said air-inlet-means and separately controllableby the movable walls of saidchambers, and means, for controlling the operation of said valvemeans.

68. A device for controlling air Pressure, comprising a plurality 'ofchambers, each provided with a movable wall, means affording communication between each of saidchambers and a producer of rarefied airymeans whereby the position of each movable wall varies according to'the degree of rare'faction of the air, atmospheric air-iinlet-means,valvemea'ns controlling said air-inlet-means and separately controllable by the movable Walls of said chambers, and sheet-controlled means for controlling the operation of said valvemeans.i- I f 69. A device for controlling air-pressure, comprising a plurality ofchambers', each provided with a movable wall, means affording communication between each' ofsaid chambers and a producer of rarefied air, means whereby the position of each movable wall varies according to the degree of rarefaction of the air, atmospheric" air-inlet-means, a plurality of valve-means controlling said a-irinlet-means and separately controllable by the movable Walls of said chambers, and means for selectively controlling the operation ofoneflormore of said valve-means;

70. Aj'device for controllin airfpressure,

comprising a plurality of cha bers-,'each provided with movable wall, means affording communication between each ofsaid' chainhers" and a producer of rarefied air, means whereby the position ofeach movable wall varies accordingto thedcgree ofrarefaction of the air, atmospheric air-inlet-means, a 'pl'urality of valve-meanscontrolling said air-inlet means and separatelycontrollable by the movable walls of said chambers, and sheetcontrolled means for selectively controlling the operation of one or more of said valvemeans, V v i a 71. A device, for controlling air-pressure, comprising a plurality of chambers, each pro,

vided with a movable wall, means afiording communication between each or" said chambers and a producer of-rarefied air, means,

whereby the position of each movable wall varies according to the degree of rarefaction of the air, a plurality of atmospheric ports, one for each of said chambers, a plurality of valves, one-for each of said ports, means whereby, each wall in its movement causes one of said valves to open its port, and adj ustable means through which the device may be set so: that, compared with each other, a plurality of the movable walls will cause the mined degreesofrarefaction of the air, each.

of which positions may be any predetermined one of a plurality of difiere'nt positions of said movable walls. i

72-. A device for controlling air-pressure, comprising a chamber provided with a movable wall, means affording communication between said chamber andaproducer of rarefied air, means whereby the position of the movable wall-varies according to the degree of rarefaction of the air, an atmospheric port in communication with said chamber, a valve controlling said port and controlled by the movable wall, and means for controlling the operation of the movable wall.

73. A device for controlling air-pressure, comprising a chamber provided, with a movable wall, mea'ns afiording communication between said chamber and a producer of rarefied air, means whereby the position ofthe movable wall varies accordingto the degree of rarefaction ofthe air, an atmospheric port in communication with said chamber, a valve controlling said port and controlled by the movable wall, and sheet-controlled means for controlling the operation of the movable wall.

74:. A device for controlling air-pressure for musical instruments, comprising a plurality of regulators, each comprising a chamher having a movable wall and a valve controlled bythe wall; means for controlling the chambers individually; and means for controlling the valves collectively.

'j 75. A device for controlling air-pressure for musical instruments, comprisingsa plurality of regulators, each comprisinga port, a valve for controlling the port, and a chamher having amovable wall for controlling the valve; and means for individually controland for collectively controlmospheric port and a valve for controlling the ort; and means for individually controlling the ports and for collectively controlling the valves.

77. A device for controlling air-pressure for musical instruments, comprising a plurality of regulators, and means for adjusting said device to vary collectively the degrees of air-pressure controlled by said regulators.

78. A device for controlling air-pressure for musical instruments, comprising a plurality of regulators, and means for adjusting said device to vary collectively the degrees of air-pressure controlled by said regulators, the collective adjustment aifecting the individual degrees of air-pressure difierently.

79. A device for controlling air-pressure for musical instruments, comprising a plurality of regulators for controlling the admission of atmospheric air, and means for adjusting said device to vary collectively the degrees of air-pressure controlled by said regulators. I 80. A device for controlling air-pressure for musical instruments, comprising a plurality of regulators for controlling the ad mission of atmospheric air to cause different degrees of air-pressure respectively, and

means for adjusting said device to vary collectively the degrees of air-pressure controlled by said regulators, the collective adjustment affecting the individual degrees of air-pressure differently.

81. A device for controlling air-pressure for musical instruments, comprising a plurality of regulators, each comprising a chamber having a movable wall and a valve controlled by the wall, and means for controlling the valves collectively.

82. In an automatic musical instrument, the combination of a main source of power;

a bellows provided with a port to atmosphere and having communication with the main source of power; a valve to control admission of atmosphere to said bellows; an abutment against which said valve normally bears; and

.means to move saidabutment to produce changes in playing intensities.

In Witness whereof, I have hereunto subscribed my name.

J. CLARKE HAGEY. 

